<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <title>文件唯一性</title>
</head>
<body>
<input type="file">
<script src="/js/md5.js"></script>
<script>
    //https://www.npmjs.com/package/js-md5
    var input  = document.querySelector('input');
    input.addEventListener('change', function () {
        var file=  this.files[0];
        var reader = new FileReader();
        reader.readAsArrayBuffer(file);
        reader.addEventListener('load',function (e) {
            var buffer = e.target.result;
            var md = md5(buffer);
            console.log(md);
        });
    });
</script>
</body>